Advertisements
Advertisements
प्रश्न
A man is thrice as old as his son. After 12 years, he will be twice as old as his son at that time. Find their present ages.
उत्तर
Let the present age of the son = x years
and the present age of the father = 3x years
After 12 years,
Son’s age will be (x + 12) years
and father’s age will be (3x + 12) years
According to the condition,
3x + 12 = 2 (x + 12)
3x + 12 = 2x+ 24
3x – 2x = 24 – 12
x = 12
∴Present age of the son = 12 years
and Present age of the father = 3×12 years
= 36 years
APPEARS IN
संबंधित प्रश्न
Solve the following equation:
`"3x"/4 - 1/4("x" - 20) = "x"/4 + 32`
Solve the following equation:
`3"a" - 1/5 = "a"/5 + 5 2/5`
Solve the following equation:
2 + y = 7
Solve the following equation:
14 = 7m
Solve the following equation:
5x – 1 = 74
19x + 13 -12x + 3 = 23
One-fifth of a number is 5, find the number.
If 15 is added to a number, the result is 69, find the number.
The sum of two numbers is 18. If one is twice the other, find the numbers.
The numerator of a fraction is four less than its denominator. If 1 is added to both, is numerator and denominator, the fraction becomes `1/2` Find the fraction.
Solve the following equation for the unknown: `(9y)/(4) - (5y)/(3) = (1)/(5)`
The present age of a man is double the age of his son. After 8 years, the ratio of their ages will be 7 : 4. Find the present ages of the man and his son.
The distance between two places Bangalore and Hyderabad is 660 km. Anand starts from Bangalore with a certain uniform speed while Sonu starts from Hyderabad at the same time with a uniform speed that is 4km more than that of Anand. If they meet each other after 5 hours, find the speed of each.
In an isosceles triangle, each of the two equal sides is 4 cm more than the base. If the perimeter of the triangle is 29 cm, find the sides of the triangle.
A 700 g dry fruit pack costs Rs. 72. It contains some cashew kernels and the rest as dry grapes. If cashew kernel costs Rs. 96 per kg and dry grapes cost Rs. 112 per kg, what were the quantities of the two dry fruits separately?
The difference between the ages of two brothers is 10 years, and 15 years ago their ages were in the ratio 2:1. Find the ratio of their ages 15 years hence.
In a factory male workers are paid one and a half times more than their female counterparts for each hour of work. In a particular week a husband and wife team worked for a total of 60 hours with the husband working twice as much as his wife. The total amount earned by both is Rs 960. If the husband's earning is 4 times that of his wife, find the number of hours each worked.
A man invested Rs 35000, a part of it at 12% and the rest at 14%. If he received a total annual interest of Rs 4460, how much did he invest at each rate?
